The document provides 19 marketing tips for retailers to optimize their holiday marketing programs, including capturing email subscribers, managing expectations with welcome emails, making informed frequency decisions, offering unsubscribe preferences, syncing with other departments, cleaning customer data, testing templates, creating cart abandonment campaigns, optimizing transactional emails, creating educational videos, and having a post-purchase email strategy. Retail holiday sales are expected to increase 4% in 2019 compared to 2.1% growth in 2018, making the holiday season critical for many retailers.